[iyonix-support] Re: Iyonix broadband access speeds

In message <70860ae64e.druck@xxxxxxxxxxxxxxxx>
 on 20 May 2007 "David J. Ruck" <druck@xxxxxxxxxxxx> wrote:

> On 19 May 2007 Andrew Pinder <Andrew.Pinder@xxxxxxxxxxxxx> wrote:
>> Contention explains why speeds drop in the evening and it's a fact of
>> life I accept.  It doesn't explain vast differences between the BT
>> speedtester result and the result from my ISP's site.

> Contention can happen at two places, between you and the exhange which
> is rare, more likely its between BT's network and your ISP if they
> haven't provisioned enough bandwidth for number of customers they are
> serving (like PlusNet at the momement). Therefor you may be able to
> get a good speed a BT server, but not to your ISP (I don't get
> anything over 1900Kb/s regardless of the far higher sync rate or
> maximum stable rate figures).

You seem to have the same problem and if it is independent of line 
speed then I suspect it isn't bandwidth at the ISP that is the problem

> Anyway this is now well off topic for Iyonix-Support, so follow ups to
> csa.networking plase.

I will stick to the Iyonix specifics:  My ISP has asked to to use the 
TCP/IP Analyser on www.speedguide.net and to report the MTU and RWIN 
values.  MTU is Maximum Transmission Unit and can be set on the 
router.  RWIN is "Default TCP Receive WINdow".  I got different RWIN 
values from Firefox2/RO511 and IE6/Win98SE and the recommendation from 
both tests was to increase the value significantly

I can't find any reference to RWIN anywhere in RISC OS - it isn't a 
system variable.  My questions are: In RO 5 who or what sets it?  The 
browser?  The OS?  The TCP/IP stack? The ADSL modem/router?  Do we 
need an upgrade to the OS to allow us to make full use of DSLmax?

Regards

-- 
Andrew Pinder
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